Thermal decomposition of stored bleach

[chem geek]

Dilution of bleach or chlorinating liquid by 1 in 10,000 will result in a measured ppm that is the Trade % of the original liquid. So two dilutions of 1 in 100 are the easiest to do. That is about 1-1/4 fluid ounces (about 7-3/4 teaspoons) in one gallon, done twice (i.e. dilute once, then take 1-1/4 fluid ounces and add to another gallon, mix and measure). Or you can do 2 teaspoons in one quart, done twice.

Be sure and test the FC of the tap water you are using and subtract that (once) from your measured result.

I've also tested it in actual use, seeing the FC rise in the pool compared to what I expected (I measure within a half hour of addition -- it's pretty thoroughly mixed after 20 minutes).

Richard